Zirkulationspumpe Modbus Register 711: Name Ruecklauftemperatur an der Zirkulations Leitung

Technical Definition

The register name Ruecklauftemperatur an der Zirkulations Leitung at address 711 is used to monitor name ruecklauftemperatur an der zirkulations leitung on the Zirkulationspumpe.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: °C
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read name Ruecklauftemperatur an der Zirkulations Leitung (Address: 711)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=711, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "name Ruecklauftemperatur an der Zirkulations Leitung"
  address: 711
  value_type: U_WORD
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Zirkulationspumpe]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Return Temperature (Celsius). Temperature of the return flow in the circulation line.

Troubleshooting: Low: Circulation pump issue, insufficient heating, or insulation problem. High: Overheating or control fault.